I have several modules equipped with sensors running the IOT_demo software ( sensor mode ).It worked for almost 1 year.This the 12nd may ( about 11:00am HK time ), my modules cannot send datas to the espressif cloud server.All my modules now are running in a loop seeking the next memorised wif networks.

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Espressif Systems is a fabless semiconductor company providing cutting-edge low power WiFi SoCs and wireless solutions for wireless communications and Internet of Things applications. We are the manufacturer of ESP8266EX.